In the API, it is currently possible to request the uc list for multiple users (not really well explained in the api.php help btw.) You can limit these results with uclimit. You can do: "Get the last 50 contributions made by either of these 8 users", with that option. However it is very difficult to do something like: "get the last 5 contributions of these 8 users". I'm working on a "userwatchlist" type of javascript on en.wikipedia.org and I could really benefit from a uclimitperuser.

This isn't gonna happen, because it would allow for huge limits (uclimit=500&ucuser=A|B|C|....|Z would give 13000 results) and lots of DB queries. Even if this were to be implemented, it would hardly be faster than simply doing 8 requests.
So you're just gonna have to do:
ucuser=Alice&uclimit=5
ucuser=Bob&uclimit=5
etc.

Note

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